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A piece of rough diamond which has the typical non-transparent skin. This rough diamond is easily clarity graded since the skin is completely transparent. Commonly called a glassie. Color can be just as deceptive as clarity in grading.Often the skin of the piece of rough hides the true tinted body color. For example, a rough piece with a greenish skin will most likely end up as a medium to dark yellow.Even in a glassie, color may end up two to three grades lower after finishing.olor can be just as deceptive as clarity in grading. Often the skin of the piece of rough hides the true tinted body color. For example, a rough piece with a greenish skin will most likely end up as a medium to dark yellow.
Any mineral with roughly a hardness of 6 or more on the Mohs scale of mineral hardness could scratch glass, which is â¦ Some minerals that could scratch glass would be quartz, topaz, corundum, and diamond. â¦ Any type of feldspar or quartz. Â»More detailed.